One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(17,18,23,19)(20,28,31,32)(21,25,22,27)(24,30,26,29)(1,3)(2,5)(4,8)(6,7)(9,10)(11,15)(12,16)(13,14)(17,19,23,18)(20,26,31,24)(21,25,22,27)(28,29,32,30)(10,14)(15,16)(17,20)(18,24)(19,26)(21,29)(22,30)(23,31)(25,32)(27,28) involution — undirected(2,6)(5,7)(9,11,13,12)(10,15,14,16)(17,21,23,22)(18,25,19,27)(20,29,31,30)(24,32,26,28)(3,8)(5,7)(9,12,13,11)(10,15,14,16)(17,21,23,22)(18,25,19,27)(20,30,31,29)(24,28,26,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.